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-rw-r--r--drivers/char/n_tty.c792
1 files changed, 620 insertions, 172 deletions
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index efbfe9612658..f6f0e4ec2b51 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -47,8 +47,8 @@
47#include <linux/bitops.h> 47#include <linux/bitops.h>
48#include <linux/audit.h> 48#include <linux/audit.h>
49#include <linux/file.h> 49#include <linux/file.h>
50#include <linux/uaccess.h>
50 51
51#include <asm/uaccess.h>
52#include <asm/system.h> 52#include <asm/system.h>
53 53
54/* number of characters left in xmit buffer before select has we have room */ 54/* number of characters left in xmit buffer before select has we have room */
@@ -62,6 +62,17 @@
62#define TTY_THRESHOLD_THROTTLE 128 /* now based on remaining room */ 62#define TTY_THRESHOLD_THROTTLE 128 /* now based on remaining room */
63#define TTY_THRESHOLD_UNTHROTTLE 128 63#define TTY_THRESHOLD_UNTHROTTLE 128
64 64
65/*
66 * Special byte codes used in the echo buffer to represent operations
67 * or special handling of characters. Bytes in the echo buffer that
68 * are not part of such special blocks are treated as normal character
69 * codes.
70 */
71#define ECHO_OP_START 0xff
72#define ECHO_OP_MOVE_BACK_COL 0x80
73#define ECHO_OP_SET_CANON_COL 0x81
74#define ECHO_OP_ERASE_TAB 0x82
75
65static inline unsigned char *alloc_buf(void) 76static inline unsigned char *alloc_buf(void)
66{ 77{
67 gfp_t prio = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL; 78 gfp_t prio = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
@@ -169,6 +180,7 @@ static void check_unthrottle(struct tty_struct *tty)
169 * 180 *
170 * Locking: tty_read_lock for read fields. 181 * Locking: tty_read_lock for read fields.
171 */ 182 */
183
172static void reset_buffer_flags(struct tty_struct *tty) 184static void reset_buffer_flags(struct tty_struct *tty)
173{ 185{
174 unsigned long flags; 186 unsigned long flags;
@@ -176,6 +188,11 @@ static void reset_buffer_flags(struct tty_struct *tty)
176 spin_lock_irqsave(&tty->read_lock, flags); 188 spin_lock_irqsave(&tty->read_lock, flags);
177 tty->read_head = tty->read_tail = tty->read_cnt = 0; 189 tty->read_head = tty->read_tail = tty->read_cnt = 0;
178 spin_unlock_irqrestore(&tty->read_lock, flags); 190 spin_unlock_irqrestore(&tty->read_lock, flags);
191
192 mutex_lock(&tty->echo_lock);
193 tty->echo_pos = tty->echo_cnt = tty->echo_overrun = 0;
194 mutex_unlock(&tty->echo_lock);
195
179 tty->canon_head = tty->canon_data = tty->erasing = 0; 196 tty->canon_head = tty->canon_data = tty->erasing = 0;
180 memset(&tty->read_flags, 0, sizeof tty->read_flags); 197 memset(&tty->read_flags, 0, sizeof tty->read_flags);
181 n_tty_set_room(tty); 198 n_tty_set_room(tty);
@@ -266,89 +283,118 @@ static inline int is_continuation(unsigned char c, struct tty_struct *tty)
266} 283}
267 284
268/** 285/**
269 * opost - output post processor 286 * do_output_char - output one character
270 * @c: character (or partial unicode symbol) 287 * @c: character (or partial unicode symbol)
271 * @tty: terminal device 288 * @tty: terminal device
289 * @space: space available in tty driver write buffer
272 * 290 *
273 * Perform OPOST processing. Returns -1 when the output device is 291 * This is a helper function that handles one output character
274 * full and the character must be retried. Note that Linux currently 292 * (including special characters like TAB, CR, LF, etc.),
275 * ignores TABDLY, CRDLY, VTDLY, FFDLY and NLDLY. They simply aren't 293 * putting the results in the tty driver's write buffer.
276 * relevant in the world today. If you ever need them, add them here. 294 *
295 * Note that Linux currently ignores TABDLY, CRDLY, VTDLY, FFDLY
296 * and NLDLY. They simply aren't relevant in the world today.
297 * If you ever need them, add them here.
298 *
299 * Returns the number of bytes of buffer space used or -1 if
300 * no space left.
277 * 301 *
278 * Called from both the receive and transmit sides and can be called 302 * Locking: should be called under the output_lock to protect
279 * re-entrantly. Relies on lock_kernel() for tty->column state. 303 * the column state and space left in the buffer
280 */ 304 */
281 305
282static int opost(unsigned char c, struct tty_struct *tty) 306static int do_output_char(unsigned char c, struct tty_struct *tty, int space)
283{ 307{
284 int space, spaces; 308 int spaces;
285 309
286 space = tty_write_room(tty);
287 if (!space) 310 if (!space)
288 return -1; 311 return -1;
289 312
290 lock_kernel(); 313 switch (c) {
291 if (O_OPOST(tty)) { 314 case '\n':
292 switch (c) { 315 if (O_ONLRET(tty))
293 case '\n': 316 tty->column = 0;
294 if (O_ONLRET(tty)) 317 if (O_ONLCR(tty)) {
295 tty->column = 0; 318 if (space < 2)
296 if (O_ONLCR(tty)) { 319 return -1;
297 if (space < 2) {
298 unlock_kernel();
299 return -1;
300 }
301 tty_put_char(tty, '\r');
302 tty->column = 0;
303 }
304 tty->canon_column = tty->column;
305 break;
306 case '\r':
307 if (O_ONOCR(tty) && tty->column == 0) {
308 unlock_kernel();
309 return 0;
310 }
311 if (O_OCRNL(tty)) {
312 c = '\n';
313 if (O_ONLRET(tty))
314 tty->canon_column = tty->column = 0;
315 break;
316 }
317 tty->canon_column = tty->column = 0; 320 tty->canon_column = tty->column = 0;
321 tty_put_char(tty, '\r');
322 tty_put_char(tty, c);
323 return 2;
324 }
325 tty->canon_column = tty->column;
326 break;
327 case '\r':
328 if (O_ONOCR(tty) && tty->column == 0)
329 return 0;
330 if (O_OCRNL(tty)) {
331 c = '\n';
332 if (O_ONLRET(tty))
333 tty->canon_column = tty->column = 0;
318 break; 334 break;
319 case '\t': 335 }
320 spaces = 8 - (tty->column & 7); 336 tty->canon_column = tty->column = 0;
321 if (O_TABDLY(tty) == XTABS) { 337 break;
322 if (space < spaces) { 338 case '\t':
323 unlock_kernel(); 339 spaces = 8 - (tty->column & 7);
324 return -1; 340 if (O_TABDLY(tty) == XTABS) {
325 } 341 if (space < spaces)
326 tty->column += spaces; 342 return -1;
327 tty->ops->write(tty, " ", spaces);
328 unlock_kernel();
329 return 0;
330 }
331 tty->column += spaces; 343 tty->column += spaces;
332 break; 344 tty->ops->write(tty, " ", spaces);
333 case '\b': 345 return spaces;
334 if (tty->column > 0) 346 }
335 tty->column--; 347 tty->column += spaces;
336 break; 348 break;
337 default: 349 case '\b':
350 if (tty->column > 0)
351 tty->column--;
352 break;
353 default:
354 if (!iscntrl(c)) {
338 if (O_OLCUC(tty)) 355 if (O_OLCUC(tty))
339 c = toupper(c); 356 c = toupper(c);
340 if (!iscntrl(c) && !is_continuation(c, tty)) 357 if (!is_continuation(c, tty))
341 tty->column++; 358 tty->column++;
342 break;
343 } 359 }
360 break;
344 } 361 }
362
345 tty_put_char(tty, c); 363 tty_put_char(tty, c);
346 unlock_kernel(); 364 return 1;
347 return 0;
348} 365}
349 366
350/** 367/**
351 * opost_block - block postprocess 368 * process_output - output post processor
369 * @c: character (or partial unicode symbol)
370 * @tty: terminal device
371 *
372 * Perform OPOST processing. Returns -1 when the output device is
373 * full and the character must be retried.
374 *
375 * Locking: output_lock to protect column state and space left
376 * (also, this is called from n_tty_write under the
377 * tty layer write lock)
378 */
379
380static int process_output(unsigned char c, struct tty_struct *tty)
381{
382 int space, retval;
383
384 mutex_lock(&tty->output_lock);
385
386 space = tty_write_room(tty);
387 retval = do_output_char(c, tty, space);
388
389 mutex_unlock(&tty->output_lock);
390 if (retval < 0)
391 return -1;
392 else
393 return 0;
394}
395
396/**
397 * process_output_block - block post processor
352 * @tty: terminal device 398 * @tty: terminal device
353 * @inbuf: user buffer 399 * @inbuf: user buffer
354 * @nr: number of bytes 400 * @nr: number of bytes
@@ -358,26 +404,32 @@ static int opost(unsigned char c, struct tty_struct *tty)
358 * the simple cases normally found and helps to generate blocks of 404 * the simple cases normally found and helps to generate blocks of
359 * symbols for the console driver and thus improve performance. 405 * symbols for the console driver and thus improve performance.
360 * 406 *
361 * Called from n_tty_write under the tty layer write lock. Relies 407 * Locking: output_lock to protect column state and space left
362 * on lock_kernel for the tty->column state. 408 * (also, this is called from n_tty_write under the
409 * tty layer write lock)
363 */ 410 */
364 411
365static ssize_t opost_block(struct tty_struct *tty, 412static ssize_t process_output_block(struct tty_struct *tty,
366 const unsigned char *buf, unsigned int nr) 413 const unsigned char *buf, unsigned int nr)
367{ 414{
368 int space; 415 int space;
369 int i; 416 int i;
370 const unsigned char *cp; 417 const unsigned char *cp;
371 418
419 mutex_lock(&tty->output_lock);
420
372 space = tty_write_room(tty); 421 space = tty_write_room(tty);
373 if (!space) 422 if (!space) {
423 mutex_unlock(&tty->output_lock);
374 return 0; 424 return 0;
425 }
375 if (nr > space) 426 if (nr > space)
376 nr = space; 427 nr = space;
377 428
378 lock_kernel();
379 for (i = 0, cp = buf; i < nr; i++, cp++) { 429 for (i = 0, cp = buf; i < nr; i++, cp++) {
380 switch (*cp) { 430 unsigned char c = *cp;
431
432 switch (c) {
381 case '\n': 433 case '\n':
382 if (O_ONLRET(tty)) 434 if (O_ONLRET(tty))
383 tty->column = 0; 435 tty->column = 0;
@@ -399,54 +451,403 @@ static ssize_t opost_block(struct tty_struct *tty,
399 tty->column--; 451 tty->column--;
400 break; 452 break;
401 default: 453 default:
402 if (O_OLCUC(tty)) 454 if (!iscntrl(c)) {
403 goto break_out; 455 if (O_OLCUC(tty))
404 if (!iscntrl(*cp)) 456 goto break_out;
405 tty->column++; 457 if (!is_continuation(c, tty))
458 tty->column++;
459 }
406 break; 460 break;
407 } 461 }
408 } 462 }
409break_out: 463break_out:
410 if (tty->ops->flush_chars)
411 tty->ops->flush_chars(tty);
412 i = tty->ops->write(tty, buf, i); 464 i = tty->ops->write(tty, buf, i);
413 unlock_kernel(); 465
466 mutex_unlock(&tty->output_lock);
414 return i; 467 return i;
415} 468}
416 469
470/**
471 * process_echoes - write pending echo characters
472 * @tty: terminal device
473 *
474 * Write previously buffered echo (and other ldisc-generated)
475 * characters to the tty.
476 *
477 * Characters generated by the ldisc (including echoes) need to
478 * be buffered because the driver's write buffer can fill during
479 * heavy program output. Echoing straight to the driver will
480 * often fail under these conditions, causing lost characters and
481 * resulting mismatches of ldisc state information.
482 *
483 * Since the ldisc state must represent the characters actually sent
484 * to the driver at the time of the write, operations like certain
485 * changes in column state are also saved in the buffer and executed
486 * here.
487 *
488 * A circular fifo buffer is used so that the most recent characters
489 * are prioritized. Also, when control characters are echoed with a
490 * prefixed "^", the pair is treated atomically and thus not separated.
491 *
492 * Locking: output_lock to protect column state and space left,
493 * echo_lock to protect the echo buffer
494 */
495
496static void process_echoes(struct tty_struct *tty)
497{
498 int space, nr;
499 unsigned char c;
500 unsigned char *cp, *buf_end;
501
502 if (!tty->echo_cnt)
503 return;
504
505 mutex_lock(&tty->output_lock);
506 mutex_lock(&tty->echo_lock);
507
508 space = tty_write_room(tty);
509
510 buf_end = tty->echo_buf + N_TTY_BUF_SIZE;
511 cp = tty->echo_buf + tty->echo_pos;
512 nr = tty->echo_cnt;
513 while (nr > 0) {
514 c = *cp;
515 if (c == ECHO_OP_START) {
516 unsigned char op;
517 unsigned char *opp;
518 int no_space_left = 0;
519
520 /*
521 * If the buffer byte is the start of a multi-byte
522 * operation, get the next byte, which is either the
523 * op code or a control character value.
524 */
525 opp = cp + 1;
526 if (opp == buf_end)
527 opp -= N_TTY_BUF_SIZE;
528 op = *opp;
529
530 switch (op) {
531 unsigned int num_chars, num_bs;
532
533 case ECHO_OP_ERASE_TAB:
534 if (++opp == buf_end)
535 opp -= N_TTY_BUF_SIZE;
536 num_chars = *opp;
537
538 /*
539 * Determine how many columns to go back
540 * in order to erase the tab.
541 * This depends on the number of columns
542 * used by other characters within the tab
543 * area. If this (modulo 8) count is from
544 * the start of input rather than from a
545 * previous tab, we offset by canon column.
546 * Otherwise, tab spacing is normal.
547 */
548 if (!(num_chars & 0x80))
549 num_chars += tty->canon_column;
550 num_bs = 8 - (num_chars & 7);
551
552 if (num_bs > space) {
553 no_space_left = 1;
554 break;
555 }
556 space -= num_bs;
557 while (num_bs--) {
558 tty_put_char(tty, '\b');
559 if (tty->column > 0)
560 tty->column--;
561 }
562 cp += 3;
563 nr -= 3;
564 break;
565
566 case ECHO_OP_SET_CANON_COL:
567 tty->canon_column = tty->column;
568 cp += 2;
569 nr -= 2;
570 break;
571
572 case ECHO_OP_MOVE_BACK_COL:
573 if (tty->column > 0)
574 tty->column--;
575 cp += 2;
576 nr -= 2;
577 break;
578
579 case ECHO_OP_START:
580 /* This is an escaped echo op start code */
581 if (!space) {
582 no_space_left = 1;
583 break;
584 }
585 tty_put_char(tty, ECHO_OP_START);
586 tty->column++;
587 space--;
588 cp += 2;
589 nr -= 2;
590 break;
591
592 default:
593 if (iscntrl(op)) {
594 if (L_ECHOCTL(tty)) {
595 /*
596 * Ensure there is enough space
597 * for the whole ctrl pair.
598 */
599 if (space < 2) {
600 no_space_left = 1;
601 break;
602 }
603 tty_put_char(tty, '^');
604 tty_put_char(tty, op ^ 0100);
605 tty->column += 2;
606 space -= 2;
607 } else {
608 if (!space) {
609 no_space_left = 1;
610 break;
611 }
612 tty_put_char(tty, op);
613 space--;
614 }
615 }
616 /*
617 * If above falls through, this was an
618 * undefined op.
619 */
620 cp += 2;
621 nr -= 2;
622 }
623
624 if (no_space_left)
625 break;
626 } else {
627 int retval;
628
629 retval = do_output_char(c, tty, space);
630 if (retval < 0)
631 break;
632 space -= retval;
633 cp += 1;
634 nr -= 1;
635 }
636
637 /* When end of circular buffer reached, wrap around */
638 if (cp >= buf_end)
639 cp -= N_TTY_BUF_SIZE;
640 }
641
642 if (nr == 0) {
643 tty->echo_pos = 0;
644 tty->echo_cnt = 0;
645 tty->echo_overrun = 0;
646 } else {
647 int num_processed = tty->echo_cnt - nr;
648 tty->echo_pos += num_processed;
649 tty->echo_pos &= N_TTY_BUF_SIZE - 1;
650 tty->echo_cnt = nr;
651 if (num_processed > 0)
652 tty->echo_overrun = 0;
653 }
654
655 mutex_unlock(&tty->echo_lock);
656 mutex_unlock(&tty->output_lock);
657
658 if (tty->ops->flush_chars)
659 tty->ops->flush_chars(tty);
660}
417 661
418/** 662/**
419 * echo_char - echo characters 663 * add_echo_byte - add a byte to the echo buffer
664 * @c: unicode byte to echo
665 * @tty: terminal device
666 *
667 * Add a character or operation byte to the echo buffer.
668 *
669 * Should be called under the echo lock to protect the echo buffer.
670 */
671
672static void add_echo_byte(unsigned char c, struct tty_struct *tty)
673{
674 int new_byte_pos;
675
676 if (tty->echo_cnt == N_TTY_BUF_SIZE) {
677 /* Circular buffer is already at capacity */
678 new_byte_pos = tty->echo_pos;
679
680 /*
681 * Since the buffer start position needs to be advanced,
682 * be sure to step by a whole operation byte group.
683 */
684 if (tty->echo_buf[tty->echo_pos] == ECHO_OP_START) {
685 if (tty->echo_buf[(tty->echo_pos + 1) &
686 (N_TTY_BUF_SIZE - 1)] ==
687 ECHO_OP_ERASE_TAB) {
688 tty->echo_pos += 3;
689 tty->echo_cnt -= 2;
690 } else {
691 tty->echo_pos += 2;
692 tty->echo_cnt -= 1;
693 }
694 } else {
695 tty->echo_pos++;
696 }
697 tty->echo_pos &= N_TTY_BUF_SIZE - 1;
698
699 tty->echo_overrun = 1;
700 } else {
701 new_byte_pos = tty->echo_pos + tty->echo_cnt;
702 new_byte_pos &= N_TTY_BUF_SIZE - 1;
703 tty->echo_cnt++;
704 }
705
706 tty->echo_buf[new_byte_pos] = c;
707}
708
709/**
710 * echo_move_back_col - add operation to move back a column
711 * @tty: terminal device
712 *
713 * Add an operation to the echo buffer to move back one column.
714 *
715 * Locking: echo_lock to protect the echo buffer
716 */
717
718static void echo_move_back_col(struct tty_struct *tty)
719{
720 mutex_lock(&tty->echo_lock);
721
722 add_echo_byte(ECHO_OP_START, tty);
723 add_echo_byte(ECHO_OP_MOVE_BACK_COL, tty);
724
725 mutex_unlock(&tty->echo_lock);
726}
727
728/**
729 * echo_set_canon_col - add operation to set the canon column
730 * @tty: terminal device
731 *
732 * Add an operation to the echo buffer to set the canon column
733 * to the current column.
734 *
735 * Locking: echo_lock to protect the echo buffer
736 */
737
738static void echo_set_canon_col(struct tty_struct *tty)
739{
740 mutex_lock(&tty->echo_lock);
741
742 add_echo_byte(ECHO_OP_START, tty);
743 add_echo_byte(ECHO_OP_SET_CANON_COL, tty);
744
745 mutex_unlock(&tty->echo_lock);
746}
747
748/**
749 * echo_erase_tab - add operation to erase a tab
750 * @num_chars: number of character columns already used
751 * @after_tab: true if num_chars starts after a previous tab
752 * @tty: terminal device
753 *
754 * Add an operation to the echo buffer to erase a tab.
755 *
756 * Called by the eraser function, which knows how many character
757 * columns have been used since either a previous tab or the start
758 * of input. This information will be used later, along with
759 * canon column (if applicable), to go back the correct number
760 * of columns.
761 *
762 * Locking: echo_lock to protect the echo buffer
763 */
764
765static void echo_erase_tab(unsigned int num_chars, int after_tab,
766 struct tty_struct *tty)
767{
768 mutex_lock(&tty->echo_lock);
769
770 add_echo_byte(ECHO_OP_START, tty);
771 add_echo_byte(ECHO_OP_ERASE_TAB, tty);
772
773 /* We only need to know this modulo 8 (tab spacing) */
774 num_chars &= 7;
775
776 /* Set the high bit as a flag if num_chars is after a previous tab */
777 if (after_tab)
778 num_chars |= 0x80;
779
780 add_echo_byte(num_chars, tty);
781
782 mutex_unlock(&tty->echo_lock);
783}
784
785/**
786 * echo_char_raw - echo a character raw
420 * @c: unicode byte to echo 787 * @c: unicode byte to echo
421 * @tty: terminal device 788 * @tty: terminal device
422 * 789 *
423 * Echo user input back onto the screen. This must be called only when 790 * Echo user input back onto the screen. This must be called only when
424 * L_ECHO(tty) is true. Called from the driver receive_buf path. 791 * L_ECHO(tty) is true. Called from the driver receive_buf path.
425 * 792 *
426 * Relies on BKL for tty column locking 793 * This variant does not treat control characters specially.
794 *
795 * Locking: echo_lock to protect the echo buffer
796 */
797
798static void echo_char_raw(unsigned char c, struct tty_struct *tty)
799{
800 mutex_lock(&tty->echo_lock);
801
802 if (c == ECHO_OP_START) {
803 add_echo_byte(ECHO_OP_START, tty);
804 add_echo_byte(ECHO_OP_START, tty);
805 } else {
806 add_echo_byte(c, tty);
807 }
808
809 mutex_unlock(&tty->echo_lock);
810}
811
812/**
813 * echo_char - echo a character
814 * @c: unicode byte to echo
815 * @tty: terminal device
816 *
817 * Echo user input back onto the screen. This must be called only when
818 * L_ECHO(tty) is true. Called from the driver receive_buf path.
819 *
820 * This variant tags control characters to be possibly echoed as
821 * as "^X" (where X is the letter representing the control char).
822 *
823 * Locking: echo_lock to protect the echo buffer
427 */ 824 */
428 825
429static void echo_char(unsigned char c, struct tty_struct *tty) 826static void echo_char(unsigned char c, struct tty_struct *tty)
430{ 827{
431 if (L_ECHOCTL(tty) && iscntrl(c) && c != '\t') { 828 mutex_lock(&tty->echo_lock);
432 tty_put_char(tty, '^'); 829
433 tty_put_char(tty, c ^ 0100); 830 if (c == ECHO_OP_START) {
434 tty->column += 2; 831 add_echo_byte(ECHO_OP_START, tty);
435 } else 832 add_echo_byte(ECHO_OP_START, tty);
436 opost(c, tty); 833 } else {
834 if (iscntrl(c) && c != '\t')
835 add_echo_byte(ECHO_OP_START, tty);
836 add_echo_byte(c, tty);
837 }
838
839 mutex_unlock(&tty->echo_lock);
437} 840}
438 841
439/** 842/**
440 * finsh_erasing - complete erase 843 * finish_erasing - complete erase
441 * @tty: tty doing the erase 844 * @tty: tty doing the erase
442 *
443 * Relies on BKL for tty column locking
444 */ 845 */
846
445static inline void finish_erasing(struct tty_struct *tty) 847static inline void finish_erasing(struct tty_struct *tty)
446{ 848{
447 if (tty->erasing) { 849 if (tty->erasing) {
448 tty_put_char(tty, '/'); 850 echo_char_raw('/', tty);
449 tty->column++;
450 tty->erasing = 0; 851 tty->erasing = 0;
451 } 852 }
452} 853}
@@ -460,7 +861,7 @@ static inline void finish_erasing(struct tty_struct *tty)
460 * present in the stream from the driver layer. Handles the complexities 861 * present in the stream from the driver layer. Handles the complexities
461 * of UTF-8 multibyte symbols. 862 * of UTF-8 multibyte symbols.
462 * 863 *
463 * Locking: read_lock for tty buffers, BKL for column/erasing state 864 * Locking: read_lock for tty buffers
464 */ 865 */
465 866
466static void eraser(unsigned char c, struct tty_struct *tty) 867static void eraser(unsigned char c, struct tty_struct *tty)
@@ -471,7 +872,7 @@ static void eraser(unsigned char c, struct tty_struct *tty)
471 872
472 /* FIXME: locking needed ? */ 873 /* FIXME: locking needed ? */
473 if (tty->read_head == tty->canon_head) { 874 if (tty->read_head == tty->canon_head) {
474 /* opost('\a', tty); */ /* what do you think? */ 875 /* process_output('\a', tty); */ /* what do you think? */
475 return; 876 return;
476 } 877 }
477 if (c == ERASE_CHAR(tty)) 878 if (c == ERASE_CHAR(tty))
@@ -497,7 +898,7 @@ static void eraser(unsigned char c, struct tty_struct *tty)
497 echo_char(KILL_CHAR(tty), tty); 898 echo_char(KILL_CHAR(tty), tty);
498 /* Add a newline if ECHOK is on and ECHOKE is off. */ 899 /* Add a newline if ECHOK is on and ECHOKE is off. */
499 if (L_ECHOK(tty)) 900 if (L_ECHOK(tty))
500 opost('\n', tty); 901 echo_char_raw('\n', tty);
501 return; 902 return;
502 } 903 }
503 kill_type = KILL; 904 kill_type = KILL;
@@ -533,67 +934,61 @@ static void eraser(unsigned char c, struct tty_struct *tty)
533 if (L_ECHO(tty)) { 934 if (L_ECHO(tty)) {
534 if (L_ECHOPRT(tty)) { 935 if (L_ECHOPRT(tty)) {
535 if (!tty->erasing) { 936 if (!tty->erasing) {
536 tty_put_char(tty, '\\'); 937 echo_char_raw('\\', tty);
537 tty->column++;
538 tty->erasing = 1; 938 tty->erasing = 1;
539 } 939 }
540 /* if cnt > 1, output a multi-byte character */ 940 /* if cnt > 1, output a multi-byte character */
541 echo_char(c, tty); 941 echo_char(c, tty);
542 while (--cnt > 0) { 942 while (--cnt > 0) {
543 head = (head+1) & (N_TTY_BUF_SIZE-1); 943 head = (head+1) & (N_TTY_BUF_SIZE-1);
544 tty_put_char(tty, tty->read_buf[head]); 944 echo_char_raw(tty->read_buf[head], tty);
945 echo_move_back_col(tty);
545 } 946 }
546 } else if (kill_type == ERASE && !L_ECHOE(tty)) { 947 } else if (kill_type == ERASE && !L_ECHOE(tty)) {
547 echo_char(ERASE_CHAR(tty), tty); 948 echo_char(ERASE_CHAR(tty), tty);
548 } else if (c == '\t') { 949 } else if (c == '\t') {
549 unsigned int col = tty->canon_column; 950 unsigned int num_chars = 0;
550 unsigned long tail = tty->canon_head; 951 int after_tab = 0;
551 952 unsigned long tail = tty->read_head;
552 /* Find the column of the last char. */ 953
553 while (tail != tty->read_head) { 954 /*
955 * Count the columns used for characters
956 * since the start of input or after a
957 * previous tab.
958 * This info is used to go back the correct
959 * number of columns.
960 */
961 while (tail != tty->canon_head) {
962 tail = (tail-1) & (N_TTY_BUF_SIZE-1);
554 c = tty->read_buf[tail]; 963 c = tty->read_buf[tail];
555 if (c == '\t') 964 if (c == '\t') {
556 col = (col | 7) + 1; 965 after_tab = 1;
557 else if (iscntrl(c)) { 966 break;
967 } else if (iscntrl(c)) {
558 if (L_ECHOCTL(tty)) 968 if (L_ECHOCTL(tty))
559 col += 2; 969 num_chars += 2;
560 } else if (!is_continuation(c, tty)) 970 } else if (!is_continuation(c, tty)) {
561 col++; 971 num_chars++;
562 tail = (tail+1) & (N_TTY_BUF_SIZE-1); 972 }
563 }
564
565 /* should never happen */
566 if (tty->column > 0x80000000)
567 tty->column = 0;
568
569 /* Now backup to that column. */
570 while (tty->column > col) {
571 /* Can't use opost here. */
572 tty_put_char(tty, '\b');
573 if (tty->column > 0)
574 tty->column--;
575 } 973 }
974 echo_erase_tab(num_chars, after_tab, tty);
576 } else { 975 } else {
577 if (iscntrl(c) && L_ECHOCTL(tty)) { 976 if (iscntrl(c) && L_ECHOCTL(tty)) {
578 tty_put_char(tty, '\b'); 977 echo_char_raw('\b', tty);
579 tty_put_char(tty, ' '); 978 echo_char_raw(' ', tty);
580 tty_put_char(tty, '\b'); 979 echo_char_raw('\b', tty);
581 if (tty->column > 0)
582 tty->column--;
583 } 980 }
584 if (!iscntrl(c) || L_ECHOCTL(tty)) { 981 if (!iscntrl(c) || L_ECHOCTL(tty)) {
585 tty_put_char(tty, '\b'); 982 echo_char_raw('\b', tty);
586 tty_put_char(tty, ' '); 983 echo_char_raw(' ', tty);
587 tty_put_char(tty, '\b'); 984 echo_char_raw('\b', tty);
588 if (tty->column > 0)
589 tty->column--;
590 } 985 }
591 } 986 }
592 } 987 }
593 if (kill_type == ERASE) 988 if (kill_type == ERASE)
594 break; 989 break;
595 } 990 }
596 if (tty->read_head == tty->canon_head) 991 if (tty->read_head == tty->canon_head && L_ECHO(tty))
597 finish_erasing(tty); 992 finish_erasing(tty);
598} 993}
599 994
@@ -712,6 +1107,7 @@ static inline void n_tty_receive_parity_error(struct tty_struct *tty,
712static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) 1107static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
713{ 1108{
714 unsigned long flags; 1109 unsigned long flags;
1110 int parmrk;
715 1111
716 if (tty->raw) { 1112 if (tty->raw) {
717 put_tty_queue(c, tty); 1113 put_tty_queue(c, tty);
@@ -721,18 +1117,21 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
721 if (I_ISTRIP(tty)) 1117 if (I_ISTRIP(tty))
722 c &= 0x7f; 1118 c &= 0x7f;
723 if (I_IUCLC(tty) && L_IEXTEN(tty)) 1119 if (I_IUCLC(tty) && L_IEXTEN(tty))
724 c=tolower(c); 1120 c = tolower(c);
725 1121
726 if (tty->stopped && !tty->flow_stopped && I_IXON(tty) && 1122 if (tty->stopped && !tty->flow_stopped && I_IXON(tty) &&
727 ((I_IXANY(tty) && c != START_CHAR(tty) && c != STOP_CHAR(tty)) || 1123 I_IXANY(tty) && c != START_CHAR(tty) && c != STOP_CHAR(tty) &&
728 c == INTR_CHAR(tty) || c == QUIT_CHAR(tty) || c == SUSP_CHAR(tty))) 1124 c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) && c != SUSP_CHAR(tty)) {
729 start_tty(tty); 1125 start_tty(tty);
1126 process_echoes(tty);
1127 }
730 1128
731 if (tty->closing) { 1129 if (tty->closing) {
732 if (I_IXON(tty)) { 1130 if (I_IXON(tty)) {
733 if (c == START_CHAR(tty)) 1131 if (c == START_CHAR(tty)) {
734 start_tty(tty); 1132 start_tty(tty);
735 else if (c == STOP_CHAR(tty)) 1133 process_echoes(tty);
1134 } else if (c == STOP_CHAR(tty))
736 stop_tty(tty); 1135 stop_tty(tty);
737 } 1136 }
738 return; 1137 return;
@@ -745,19 +1144,23 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
745 * up. 1144 * up.
746 */ 1145 */
747 if (!test_bit(c, tty->process_char_map) || tty->lnext) { 1146 if (!test_bit(c, tty->process_char_map) || tty->lnext) {
748 finish_erasing(tty);
749 tty->lnext = 0; 1147 tty->lnext = 0;
1148 parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
1149 if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
1150 /* beep if no space */
1151 if (L_ECHO(tty))
1152 process_output('\a', tty);
1153 return;
1154 }
750 if (L_ECHO(tty)) { 1155 if (L_ECHO(tty)) {
751 if (tty->read_cnt >= N_TTY_BUF_SIZE-1) { 1156 finish_erasing(tty);
752 tty_put_char(tty, '\a'); /* beep if no space */
753 return;
754 }
755 /* Record the column of first canon char. */ 1157 /* Record the column of first canon char. */
756 if (tty->canon_head == tty->read_head) 1158 if (tty->canon_head == tty->read_head)
757 tty->canon_column = tty->column; 1159 echo_set_canon_col(tty);
758 echo_char(c, tty); 1160 echo_char(c, tty);
1161 process_echoes(tty);
759 } 1162 }
760 if (I_PARMRK(tty) && c == (unsigned char) '\377') 1163 if (parmrk)
761 put_tty_queue(c, tty); 1164 put_tty_queue(c, tty);
762 put_tty_queue(c, tty); 1165 put_tty_queue(c, tty);
763 return; 1166 return;
@@ -766,6 +1169,7 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
766 if (I_IXON(tty)) { 1169 if (I_IXON(tty)) {
767 if (c == START_CHAR(tty)) { 1170 if (c == START_CHAR(tty)) {
768 start_tty(tty); 1171 start_tty(tty);
1172 process_echoes(tty);
769 return; 1173 return;
770 } 1174 }
771 if (c == STOP_CHAR(tty)) { 1175 if (c == STOP_CHAR(tty)) {
@@ -786,7 +1190,6 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
786 if (c == SUSP_CHAR(tty)) { 1190 if (c == SUSP_CHAR(tty)) {
787send_signal: 1191send_signal:
788 /* 1192 /*
789 * Echo character, and then send the signal.
790 * Note that we do not use isig() here because we want 1193 * Note that we do not use isig() here because we want
791 * the order to be: 1194 * the order to be:
792 * 1) flush, 2) echo, 3) signal 1195 * 1) flush, 2) echo, 3) signal
@@ -795,8 +1198,12 @@ send_signal:
795 n_tty_flush_buffer(tty); 1198 n_tty_flush_buffer(tty);
796 tty_driver_flush_buffer(tty); 1199 tty_driver_flush_buffer(tty);
797 } 1200 }
798 if (L_ECHO(tty)) 1201 if (I_IXON(tty))
1202 start_tty(tty);
1203 if (L_ECHO(tty)) {
799 echo_char(c, tty); 1204 echo_char(c, tty);
1205 process_echoes(tty);
1206 }
800 if (tty->pgrp) 1207 if (tty->pgrp)
801 kill_pgrp(tty->pgrp, signal, 1); 1208 kill_pgrp(tty->pgrp, signal, 1);
802 return; 1209 return;
@@ -815,6 +1222,7 @@ send_signal:
815 if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) || 1222 if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) ||
816 (c == WERASE_CHAR(tty) && L_IEXTEN(tty))) { 1223 (c == WERASE_CHAR(tty) && L_IEXTEN(tty))) {
817 eraser(c, tty); 1224 eraser(c, tty);
1225 process_echoes(tty);
818 return; 1226 return;
819 } 1227 }
820 if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) { 1228 if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) {
@@ -822,8 +1230,9 @@ send_signal:
822 if (L_ECHO(tty)) { 1230 if (L_ECHO(tty)) {
823 finish_erasing(tty); 1231 finish_erasing(tty);
824 if (L_ECHOCTL(tty)) { 1232 if (L_ECHOCTL(tty)) {
825 tty_put_char(tty, '^'); 1233 echo_char_raw('^', tty);
826 tty_put_char(tty, '\b'); 1234 echo_char_raw('\b', tty);
1235 process_echoes(tty);
827 } 1236 }
828 } 1237 }
829 return; 1238 return;
@@ -834,22 +1243,29 @@ send_signal:
834 1243
835 finish_erasing(tty); 1244 finish_erasing(tty);
836 echo_char(c, tty); 1245 echo_char(c, tty);
837 opost('\n', tty); 1246 echo_char_raw('\n', tty);
838 while (tail != tty->read_head) { 1247 while (tail != tty->read_head) {
839 echo_char(tty->read_buf[tail], tty); 1248 echo_char(tty->read_buf[tail], tty);
840 tail = (tail+1) & (N_TTY_BUF_SIZE-1); 1249 tail = (tail+1) & (N_TTY_BUF_SIZE-1);
841 } 1250 }
1251 process_echoes(tty);
842 return; 1252 return;
843 } 1253 }
844 if (c == '\n') { 1254 if (c == '\n') {
1255 if (tty->read_cnt >= N_TTY_BUF_SIZE) {
1256 if (L_ECHO(tty))
1257 process_output('\a', tty);
1258 return;
1259 }
845 if (L_ECHO(tty) || L_ECHONL(tty)) { 1260 if (L_ECHO(tty) || L_ECHONL(tty)) {
846 if (tty->read_cnt >= N_TTY_BUF_SIZE-1) 1261 echo_char_raw('\n', tty);
847 tty_put_char(tty, '\a'); 1262 process_echoes(tty);
848 opost('\n', tty);
849 } 1263 }
850 goto handle_newline; 1264 goto handle_newline;
851 } 1265 }
852 if (c == EOF_CHAR(tty)) { 1266 if (c == EOF_CHAR(tty)) {
1267 if (tty->read_cnt >= N_TTY_BUF_SIZE)
1268 return;
853 if (tty->canon_head != tty->read_head) 1269 if (tty->canon_head != tty->read_head)
854 set_bit(TTY_PUSH, &tty->flags); 1270 set_bit(TTY_PUSH, &tty->flags);
855 c = __DISABLED_CHAR; 1271 c = __DISABLED_CHAR;
@@ -857,22 +1273,28 @@ send_signal:
857 } 1273 }
858 if ((c == EOL_CHAR(tty)) || 1274 if ((c == EOL_CHAR(tty)) ||
859 (c == EOL2_CHAR(tty) && L_IEXTEN(tty))) { 1275 (c == EOL2_CHAR(tty) && L_IEXTEN(tty))) {
1276 parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty))
1277 ? 1 : 0;
1278 if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk)) {
1279 if (L_ECHO(tty))
1280 process_output('\a', tty);
1281 return;
1282 }
860 /* 1283 /*
861 * XXX are EOL_CHAR and EOL2_CHAR echoed?!? 1284 * XXX are EOL_CHAR and EOL2_CHAR echoed?!?
862 */ 1285 */
863 if (L_ECHO(tty)) { 1286 if (L_ECHO(tty)) {
864 if (tty->read_cnt >= N_TTY_BUF_SIZE-1)
865 tty_put_char(tty, '\a');
866 /* Record the column of first canon char. */ 1287 /* Record the column of first canon char. */
867 if (tty->canon_head == tty->read_head) 1288 if (tty->canon_head == tty->read_head)
868 tty->canon_column = tty->column; 1289 echo_set_canon_col(tty);
869 echo_char(c, tty); 1290 echo_char(c, tty);
1291 process_echoes(tty);
870 } 1292 }
871 /* 1293 /*
872 * XXX does PARMRK doubling happen for 1294 * XXX does PARMRK doubling happen for
873 * EOL_CHAR and EOL2_CHAR? 1295 * EOL_CHAR and EOL2_CHAR?
874 */ 1296 */
875 if (I_PARMRK(tty) && c == (unsigned char) '\377') 1297 if (parmrk)
876 put_tty_queue(c, tty); 1298 put_tty_queue(c, tty);
877 1299
878handle_newline: 1300handle_newline:
@@ -889,23 +1311,27 @@ handle_newline:
889 } 1311 }
890 } 1312 }
891 1313
892 finish_erasing(tty); 1314 parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
1315 if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
1316 /* beep if no space */
1317 if (L_ECHO(tty))
1318 process_output('\a', tty);
1319 return;
1320 }
893 if (L_ECHO(tty)) { 1321 if (L_ECHO(tty)) {
894 if (tty->read_cnt >= N_TTY_BUF_SIZE-1) { 1322 finish_erasing(tty);
895 tty_put_char(tty, '\a'); /* beep if no space */
896 return;
897 }
898 if (c == '\n') 1323 if (c == '\n')
899 opost('\n', tty); 1324 echo_char_raw('\n', tty);
900 else { 1325 else {
901 /* Record the column of first canon char. */ 1326 /* Record the column of first canon char. */
902 if (tty->canon_head == tty->read_head) 1327 if (tty->canon_head == tty->read_head)
903 tty->canon_column = tty->column; 1328 echo_set_canon_col(tty);
904 echo_char(c, tty); 1329 echo_char(c, tty);
905 } 1330 }
1331 process_echoes(tty);
906 } 1332 }
907 1333
908 if (I_PARMRK(tty) && c == (unsigned char) '\377') 1334 if (parmrk)
909 put_tty_queue(c, tty); 1335 put_tty_queue(c, tty);
910 1336
911 put_tty_queue(c, tty); 1337 put_tty_queue(c, tty);
@@ -923,10 +1349,11 @@ handle_newline:
923 1349
924static void n_tty_write_wakeup(struct tty_struct *tty) 1350static void n_tty_write_wakeup(struct tty_struct *tty)
925{ 1351{
926 if (tty->fasync) { 1352 /* Write out any echoed characters that are still pending */
927 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 1353 process_echoes(tty);
1354
1355 if (tty->fasync && test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags))
928 kill_fasync(&tty->fasync, SIGIO, POLL_OUT); 1356 kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
929 }
930} 1357}
931 1358
932/** 1359/**
@@ -1134,6 +1561,10 @@ static void n_tty_close(struct tty_struct *tty)
1134 free_buf(tty->read_buf); 1561 free_buf(tty->read_buf);
1135 tty->read_buf = NULL; 1562 tty->read_buf = NULL;
1136 } 1563 }
1564 if (tty->echo_buf) {
1565 free_buf(tty->echo_buf);
1566 tty->echo_buf = NULL;
1567 }
1137} 1568}
1138 1569
1139/** 1570/**
@@ -1151,13 +1582,19 @@ static int n_tty_open(struct tty_struct *tty)
1151 if (!tty) 1582 if (!tty)
1152 return -EINVAL; 1583 return -EINVAL;
1153 1584
1154 /* This one is ugly. Currently a malloc failure here can panic */ 1585 /* These are ugly. Currently a malloc failure here can panic */
1155 if (!tty->read_buf) { 1586 if (!tty->read_buf) {
1156 tty->read_buf = alloc_buf(); 1587 tty->read_buf = alloc_buf();
1157 if (!tty->read_buf) 1588 if (!tty->read_buf)
1158 return -ENOMEM; 1589 return -ENOMEM;
1159 } 1590 }
1591 if (!tty->echo_buf) {
1592 tty->echo_buf = alloc_buf();
1593 if (!tty->echo_buf)
1594 return -ENOMEM;
1595 }
1160 memset(tty->read_buf, 0, N_TTY_BUF_SIZE); 1596 memset(tty->read_buf, 0, N_TTY_BUF_SIZE);
1597 memset(tty->echo_buf, 0, N_TTY_BUF_SIZE);
1161 reset_buffer_flags(tty); 1598 reset_buffer_flags(tty);
1162 tty->column = 0; 1599 tty->column = 0;
1163 n_tty_set_termios(tty, NULL); 1600 n_tty_set_termios(tty, NULL);
@@ -1487,16 +1924,23 @@ do_it_again:
1487 * @buf: userspace buffer pointer 1924 * @buf: userspace buffer pointer
1488 * @nr: size of I/O 1925 * @nr: size of I/O
1489 * 1926 *
1490 * Write function of the terminal device. This is serialized with 1927 * Write function of the terminal device. This is serialized with
1491 * respect to other write callers but not to termios changes, reads 1928 * respect to other write callers but not to termios changes, reads
1492 * and other such events. We must be careful with N_TTY as the receive 1929 * and other such events. Since the receive code will echo characters,
1493 * code will echo characters, thus calling driver write methods. 1930 * thus calling driver write methods, the output_lock is used in
1931 * the output processing functions called here as well as in the
1932 * echo processing function to protect the column state and space
1933 * left in the buffer.
1494 * 1934 *
1495 * This code must be sure never to sleep through a hangup. 1935 * This code must be sure never to sleep through a hangup.
1936 *
1937 * Locking: output_lock to protect column state and space left
1938 * (note that the process_output*() functions take this
1939 * lock themselves)
1496 */ 1940 */
1497 1941
1498static ssize_t n_tty_write(struct tty_struct *tty, struct file *file, 1942static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
1499 const unsigned char *buf, size_t nr) 1943 const unsigned char *buf, size_t nr)
1500{ 1944{
1501 const unsigned char *b = buf; 1945 const unsigned char *b = buf;
1502 DECLARE_WAITQUEUE(wait, current); 1946 DECLARE_WAITQUEUE(wait, current);
@@ -1510,6 +1954,9 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
1510 return retval; 1954 return retval;
1511 } 1955 }
1512 1956
1957 /* Write out any echoed characters that are still pending */
1958 process_echoes(tty);
1959
1513 add_wait_queue(&tty->write_wait, &wait); 1960 add_wait_queue(&tty->write_wait, &wait);
1514 while (1) { 1961 while (1) {
1515 set_current_state(TASK_INTERRUPTIBLE); 1962 set_current_state(TASK_INTERRUPTIBLE);
@@ -1523,7 +1970,7 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
1523 } 1970 }
1524 if (O_OPOST(tty) && !(test_bit(TTY_HW_COOK_OUT, &tty->flags))) { 1971 if (O_OPOST(tty) && !(test_bit(TTY_HW_COOK_OUT, &tty->flags))) {
1525 while (nr > 0) { 1972 while (nr > 0) {
1526 ssize_t num = opost_block(tty, b, nr); 1973 ssize_t num = process_output_block(tty, b, nr);
1527 if (num < 0) { 1974 if (num < 0) {
1528 if (num == -EAGAIN) 1975 if (num == -EAGAIN)
1529 break; 1976 break;
@@ -1535,7 +1982,7 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
1535 if (nr == 0) 1982 if (nr == 0)
1536 break; 1983 break;
1537 c = *b; 1984 c = *b;
1538 if (opost(c, tty) < 0) 1985 if (process_output(c, tty) < 0)
1539 break; 1986 break;
1540 b++; nr--; 1987 b++; nr--;
1541 } 1988 }
@@ -1565,6 +2012,8 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
1565break_out: 2012break_out:
1566 __set_current_state(TASK_RUNNING); 2013 __set_current_state(TASK_RUNNING);
1567 remove_wait_queue(&tty->write_wait, &wait); 2014 remove_wait_queue(&tty->write_wait, &wait);
2015 if (b - buf != nr && tty->fasync)
2016 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
1568 return (b - buf) ? b - buf : retval; 2017 return (b - buf) ? b - buf : retval;
1569} 2018}
1570 2019
@@ -1663,4 +2112,3 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
1663 .receive_buf = n_tty_receive_buf, 2112 .receive_buf = n_tty_receive_buf,
1664 .write_wakeup = n_tty_write_wakeup 2113 .write_wakeup = n_tty_write_wakeup
1665}; 2114};
1666
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-08 18:21:44 -0500